SU1452630A1 - Method of rolling coil material - Google Patents

Abstract

The invention relates to the processing of metals by pressure. The aim of the invention is to improve the quality of the rolled strip by reducing the non-uniformity of internal stresses in the strip. When rolling the rolling strips with tension on the drum, the coiler between the coils of the coil winds an auxiliary strip having a transverse profile opposite to the profile of the rolled strip, and in a longitudinal section forms a cone-like shape, while winding in the direction of reducing its thickness. The transverse profile of the auxiliary strip may be made in the form of a rolled strip. The material of the auxiliary strip can be either metal or nonmetallic material, for example Teflon. The method improves the quality of thin and very thin cold rolled strips by eliminating the effect of their transverse thickness variation on the distribution of internal longitudinal stresses across the width of the strip. 3, p. fl, 1 tab. cl

Description

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The invention relates to metallurgical production, in particular to the processing of metals by pressure, and can be used in the rolling of the thinnest and finest strip, which is wound into a roll.

The aim of the invention is to increase the quality of the rolled strip due to the reduction of the non-uniformity of internal stresses in the strip.

The method is carried out as follows.

The rolled material is deformed in a rolling stand and is coiled up with a coiler, with an auxiliary strip having a transverse profile, reversed in shape of the rolled strip and a longitudinal profile in the form of a wedge, winding between the coils of the coil. in the direction of reducing its thickness. Then the inter-layer gaps arising from the presence of the cross-sectional profile of the rolled strip are filled with the material of the auxiliary strip, the profile of the formed coil remains original and unchanged and the specific stresses across the width of the rolled strip are constant. In this case, the modulus of elasticity of the auxiliary strip must be greater than or equal to the modulus of elasticity of the rolled strip so as not to cause uneven deformations of the auxiliary strip.

Reeled auxiliary strips with a lower modulus of elasticity than the elastic modulus of rolled strips should have the same profile as the rolled ones, since, due to the different thicknesses of the latter, the deformations in the center of the unwind auxiliary strips will be somewhat larger than along the edges.

In order to avoid the occurrence of scratches during the winding between the turns, a lubricant is usually applied to the coiled strip.

Getting double bent and double glazed auxiliary strips is not a big deal. The number of auxiliary strips is small, since after rolling, rolls are usually rewound with less tension and, instead of auxiliary strips, are laid with paper. Thus, it is necessary to have only a few helpers.

15

20

25 jq

35

0

five

bands and not to use each time.

The longitudinal thickness variation of the rolled strip is usually non-periodic, and chaotic in length, therefore, affect the roll profile thickness

0

five

The rolled strip will not be regular, but will be averaged over the width. . This can cause uneven deformations across the width of the auxiliary strip near the drum of the winder and, as a result, a change in the roll profile. For these reasons, the front end of the auxiliary strip, in the direction of the winder, should be 15-20% thicker than the rear end, which makes it possible to equalize the deformations of the auxiliary strip in thickness in the roll. The longitudinal profile of the auxiliary strip can be made with decreasing steps, which does not cause a strong influence on the roll profile, but is easier to perform than a continuous profile change.

Example, In a four-roll rolling mill 320, a strip of corrosion-resistant steel of 0.15 mm and a width of 250 mm by a thickness of 0.1 mm is rolled and wound into a roll. The strip at the exit has a convex cross-sectional profile, with a difference in thickness in the middle of the strip and at the edge - 2 microns. When rolling the rolled strip onto the coiler between the turns of the coil, an auxiliary metal strip of the same material with a concave cross-sectional profile and a concavity of 2 microns is wound. The ratio of the thickness of the rear end to the thickness of the front is 0.8. The shape of the rolled strip in the section from the winder to the deformation zone remains flat from the beginning to the end of the roll rolling. No gust in the rolling process is observed.

After rolling with the winding of the auxiliary strip between the turns of the roll during its rolling, similar rolls with the winding of ordinary paper are rolled. During the rolling process, the strip between the winder and the deformation zone loses its flat shape; there are cases of breaks in the strip with a focus of the a-its middle part. Roll forming profile after

Claims (4)

1. A method of rolling a web material, including the deformation of a workpiece, winding a strip into a coil with simultaneous winding between turns of a coil of an auxiliary strip, characterized in that, in order to wind a winder onto a drum, it makes 10-0 to increase the quality of a rolled sheet 5 mm per radius The result of the sy due to the reduction of the unevenness of the experimental rolling is given in the table. internal stresses in the strip, when winding use auxiliary The use of the proposed method with the profile in the cross section of rolling the rolled material of the material, the inverse of the profile rolled baking in comparison with the known methods the following advantages; 1. The ability to perform rolling with uniform tension across the width of the rolled strip, increase the tension, reduce the strain force of the metaplan, and increase the flatness of the finished strips. 2, The uniform distribution of specific tensions across the width of the rolled strip reduces the possibility of strip breaks during rolling, which reduces the downtime of the mill and increases its productivity. Invention Formula strips, and in a longitudinal section - in the form of a wedge, while winding is performed in the direction of reducing its thickness. 2. A method according to claim 1, characterized in that the profile of the auxiliary strip in the cross section has the profile of the strip being rolled. 3. Method according to paragraphs. 1 and 2, that is, an auxiliary Teflon strip is used. 4. Method according to paragraphs. 1 and 2, which is based on the use of an auxiliary metal band. Famous 5 0.15 0.10 Pr edel agaemy5 0,13 0,102 2 Loss of 2-3 wastestand on the roll after winding 1/4 of the roll thickness Loss Not observed; no resistance was observed.